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Effects of aerosol scattering phase function formulation on point-spread-function calculations.

Patrick Chervet1, Claire Lavigne, Antoine Roblin

  • 1Département d'Optique Théorique et Appliquée, Office National d'Etudes et Recherches Aérospatiales, Palaiseau, France. chervet@onera.fr

Applied Optics
|October 25, 2002
PubMed
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Atmospheric aerosols significantly degrade outdoor optical system image quality. A new Monte Carlo code, MEDIA, modeled aerosol effects on the point-spread function, revealing variations with scattering and detector settings.

Area of Science:

  • Atmospheric optics
  • Computational physics
  • Image science

Background:

  • Image quality in outdoor optical systems is degraded by atmospheric aerosols.
  • Aerosols scatter and absorb light, altering the point-spread function (PSF).
  • Understanding these effects is crucial for designing robust optical systems.

Purpose of the Study:

  • To develop and utilize a new Monte Carlo code, MEDIA (Modélisation des Effets de Diffusion Inhérents à l'Atmosphère), for calculating aerosol effects on PSF.
  • To investigate the impact of scattering phase function angular dependence on focal plane irradiance.
  • To analyze the influence of atmospheric conditions and detector characteristics.

Main Methods:

  • Developed a novel Monte Carlo code named MEDIA.

Related Experiment Videos

  • Calculated PSF properties influenced by aerosol particles.
  • Employed Mie theory and the Henyey-Greenstein formulation for scattering.
  • Varied asymmetry parameters, detector optical characteristics, and atmospheric conditions.

    • Main Results:

    • MEDIA code successfully modeled aerosol effects on PSF.
    • Significant variations in focal plane irradiance were observed.
    • Strong forward-peaked scattering phase functions and large detector fields of view caused major irradiance changes.

    Conclusions:

    • The angular dependence of the scattering phase function critically affects image quality.
    • MEDIA provides a valuable tool for simulating aerosol impacts on optical systems.
    • System design must account for aerosol scattering and detector field of view for optimal performance.